Percentage of voting equity interests acquired at the asset acquisition date tied to the development of project.

No definition available.

Name:	goro_AssetAcquisitionPercentageOfVotingInterestAcquiredTiedToDevelopmentOfProject
Namespace Prefix:	goro_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of voting equity interests acquired at the acquisition date in the asset acquisition.

+ References

No definition available.

+ Details

Name:	goro_AssetAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	goro_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Right to repurchase ownership interest by counterparty in case of milestone not achieved.

+ References

No definition available.

+ Details

Name:	goro_AssetAcquisitionRightToRepurchaseOwnershipInterest
Namespace Prefix:	goro_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount contingent consideration due upon project financing.

+ References

No definition available.

+ Details

Name:	goro_ContingentConsiderationDueUponProjectFinancing
Namespace Prefix:	goro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contingent consideration payable in cash.

+ References

No definition available.

+ Details

Name:	goro_ContingentConsiderationPayableInCash
Namespace Prefix:	goro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contingent consideration payable in shares.

+ References

No definition available.

+ Details

Name:	goro_ContingentConsiderationPayableInShares
Namespace Prefix:	goro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Leases [Line Items]

+ References

No definition available.

+ Details

Name:	goro_LeasesLineItems
Namespace Prefix:	goro_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of contingent consideration payable in shares.

+ References

No definition available.

+ Details

Name:	goro_PercentageOfContingentConsiderationPayableInShares
Namespace Prefix:	goro_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of net smelter return royalty on production from certain land parcels in the project.

+ References

No definition available.

+ Details

Name:	goro_PercentageOfNetSmelterReturnOnProduction
Namespace Prefix:	goro_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of ownership interest held in the project.

+ References

No definition available.

+ Details

Name:	goro_PercentageOfOwnershipInterestHeldInProject
Namespace Prefix:	goro_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of liability recognized from contingent consideration in asset acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 15
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6911878&loc=d3e8732-128492

+ Details

Name:	us-gaap_AssetAcquisitionContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of liability recognized from contingent consideration in asset acquisition, classified as noncurrent.

+ References

+ Details

Name:	us-gaap_AssetAcquisitionContingentConsiderationLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_SecurityDepositLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_AssetAcquisitionAxis=goro_HudbayMichiganIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AssetAcquisitionAxis=goro_AquilaResourcesIncorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=goro_GoldAndSilverStreamingAgreementWithOsiskoBermudaLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=goro_BackFortyProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=goro_AquilaResourcesIncorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AssetAcquisitionAxis=goro_BackFortyProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=goro_NinetyDaysAfterCommencementOfCommercialProductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=goro_TwoHundredAndSeventyDaysAfterCommencementOfCommercialProductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=goro_FourHundredAndFiftyDaysAfterCommencementOfCommercialProductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=goro_HudbayMichiganIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies (Narrative) (Details) $ in Thousands, $ in Millions	Dec. 30, 2013 CAD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 10, 2021 USD ($)	Dec. 31, 2013
Leases [Line Items]
Equipment purchase commitments		$ 800	$ 400
Contingent consideration		4,293	$ 4,603
HudBay Michigan Inc
Leases [Line Items]
Percentage of voting equity interests acquired					100.00%
Aquila Resources Inc. \| Gold and silver streaming agreement with Osisko Bermuda Limited \| Back Forty Project
Leases [Line Items]
Deposit amount				$ 37,200
Aquila Resources Inc. \| Back Forty Project
Leases [Line Items]
Percentage of ownership interest held	100.00%
Contingent consideration	$ 9
Contingent consideration due upon project financing	$ 3
Percentage of contingent consideration payable in shares	50.00%
Contingent consideration payable in shares	$ 3
Right to repurchase ownership interest	51.00%
Contingent consideration		$ 4,300
Aquila Resources Inc. \| Back Forty Project \| 90 days after the commencement of commercial production
Leases [Line Items]
Contingent consideration payable in cash	$ 2
Aquila Resources Inc. \| Back Forty Project \| 270 days after the commencement of commercial production
Leases [Line Items]
Contingent consideration payable in cash	2
Aquila Resources Inc. \| Back Forty Project \| 450 days after the commencement of commercial production
Leases [Line Items]
Contingent consideration payable in cash	$ 2
HudBay Michigan Inc \| HudBay Michigan Inc
Leases [Line Items]
Percentage of net smelter return royalty on production	1.00%
HudBay Michigan Inc \| Back Forty Project
Leases [Line Items]
Percentage of voting equity interests acquired at the asset acquisition date tied to the development of project	51.00%